The waiters were rude and unhelpful, the manager ditto.
这些服务员态度生硬，服务不周，经理也一样。
It is unhelpful to extrapolate general trends from one case.
根据一个案例来推断总的`趋势是没有用的。
People always complain that the big banks and big companies are unfriendly and unhelpful
人们总是抱怨大银行和大公司不友善、不愿提供帮助。
If the bank is unhelpful take it up with the Ombudsman.
银行要是不肯帮忙，就去找申诉专员。
The criticism is both unfair and unhelpful.
批评既不公正又无济于事。